Tweco 51 with SL100SV CutMaster - Manual (Page 105)

Manual 0-4640 5-41 SERVICE
5
D. Logic PC Board Replacement
Follow the antistatic procedures provided with the replacement part.
1. Remove the power supply cover.
2. Unlock the two tabs on the card guides protruding from the Main PC Board. Push in the silver part of the tab until the
black part pops out on the other side.
3. Gently pull the Logic PC Board from the Main Power PC Board.
4. Install the replacement Logic PC Board by reversing the above steps. Note the following:
a. The pins on the Logic Board must be fully seated in the J1 connector on the Main PC Board. Ensure that the tabs on
the card guides close properly.
b. The small pin inside the tab on the card guide must slide through the hole in the PC Board to ensure the PC Board is
properly secured.
5. Reinstall the power supply cover.
E. IGBT Circuit Board or Output Diode Replacement
Follow the antistatic procedures provided with the replacement part.
WARNINGS
Follow the electrostatic discharge instructions included with the component to prevent damage to the component.
Thermal pads and the large flat surface on the back of diodes and IGBTs must be kept clean. Thermal pads must not
be allowed to pick up any foreign material. A very clean installation between the module and heatsink is essential
for proper operation.
1. Remove the power supply cover.
2. Turn the Power Supply onto its side.
3. For IGBTs, disconnect the small jumpers from their connections to the Main PC Board. Label and carefully remove all
other wire connections from the Board being replaced.
4. Remove screw securing Board in place. Remove board and its screw from the power supply.
5. Use isopropyl alcohol and a clean rag to clean the heatsink. Remove all residue of the original thermal pad. Do not
scratch or abrade the surface.
6. The thermal pad, provided with the replacement part, is a thin metal pad. Remove and discard any loose protective paper
coverings from the pad.
CAUTION
Protective coverings must be removed from the thermal pad. Installing a thermal pad with protective coverings in
place will cause equipment damage or failure.
7. Apply the round thermal pad to the heatsink with a small piece of light-duty tape. Tape must cover no more than 1/8”
(3 mm) of the edge of the thermal pad. Use the screw hole in the heatsink as a guide to position the pad.
8. For IGBTs, remove the small jumpers from the component being replaced. Transfer the jumpers to the replacement
component.
9. Clean the large flat surface on the back of the replacement component with isopropyl alcohol.